@media screen and (min-width: 768px) {
    nav {
        position: static;
        width: auto;
    }

    nav > ul > li {
        display: inline-block;
    }

    nav > ul > li > a {
        margin: 5px;
        border-radius: 5px;
    }
}

@media screen and (max-width: 767px) { 
    header > button, .btn-fechar {
        display: block;
    }

    header > nav {
        background-color: #A8B545;
    }

    .texto > p {
        width: 90%;
    }
}